Initial Commit.

Fixed a few warnings and compile errors to get the project running on
Mac OS X 10.8.2 Xcode 4.5.1 SDK 10.5
Upgrade XADMaster, UniversalDetector, Sparkle.

http://code.google.com/p/theunarchiver/source/detail?r=30ed69d3c52f945eb
c0af94491493b69fa122018

https://github.com/andymatuschak/Sparkle/commit/16cdd6bf643db1098e42ae20
5e91ab3ef87c62cb
Remove Sparkle and get it compiling on 10.6 again.
Use %C with unichar instead of %d.
Remove update preferences.